1
Step-by-step explanation:
Using the definition
n =
where n! = n(n - 1)(n - 2)......
Thus
4
= ← cancel 4! on numerator and denominator
= { 0! = 1 ]
=
= 1
if you are saying purchasing 3 social media ads and one newspaper ad counts as one purchase then there are:
6 purchases
if you are asking how many of each then:
18 social media ads
6 newspaper ads
to determine the unit cost your would divide the total cost by the number sold.
7 bagels for $4.41 $4.41/7 = $.63 each at fresh side
5 bagels for $3.60 $3.60/5 = $.72 each at value mart